[PR] fix(services/azfile): avoid defaulting list size to zero [opendal]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo opened a new pull request, #7220:
URL: https://github.com/apache/opendal/pull/7220

   # Which issue does this PR close?
   
   Part of #7062.
   
   # Rationale for this change
   
   `azfile` lister currently treats missing `Content-Length` in list response as `0`.
   This conflates "unknown size" with "real zero-byte file", which breaks the mandatory list content-length semantics introduced in core.
   
   # What changes are included in this PR?
   
   - Update `core/services/azfile/src/lister.rs`:
     - Stop using `unwrap_or(0)` for file `content_length`.
     - Set `content_length` only when the service response includes `Content-Length`.
   
   This keeps real zero-byte files correct while allowing core fallback completion logic to handle missing sizes safely.
   
   Validation:
   
   - `cargo fmt`
   - `cargo check --features services-azfile,tests`
   - `cargo test -p opendal-service-azfile`
   
   # Are there any user-facing changes?
   
   Yes.
   
   For `azfile`, list entries no longer report `content_length = 0` when Azure File list response omits content length.
   
   # AI Usage Statement
   
   This PR was developed with Codex (GPT-5) assistance.
   


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Re: [PR] fix(services/azfile): avoid defaulting list size to zero [opendal]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo merged PR #7220:
URL: https://github.com/apache/opendal/pull/7220


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